bool
ResourceCache::cloneOrCreateInstanceNode(InstanceResource* res,
osg::ref_ptr<osg::Node>& output,
const osgDB::Options* readOptions)
{
output = 0L;
std::string key = res->getConfig().toJSON(false);
// exclusive lock (since it's an LRU)
{
Threading::ScopedMutexLock exclusive( _instanceMutex );
// Deep copy everything except for images. Some models may share imagery so we only want one copy of it at a time.
osg::CopyOp copyOp = osg::CopyOp::DEEP_COPY_ALL & ~osg::CopyOp::DEEP_COPY_IMAGES & ~osg::CopyOp::DEEP_COPY_TEXTURES;
// double check to avoid race condition
InstanceCache::Record rec;
if ( _instanceCache.get(key, rec) && rec.value().valid() )
{
output = osg::clone(rec.value().get(), copyOp);
}
else
{
// still not there, make it.
output = res->createNode(readOptions);
if ( output.valid() )
{
_instanceCache.insert( key, output.get() );
output = osg::clone(output.get(), copyOp);
}
}
}
return output.valid();
}
bool
ResourceCache::getOrCreateInstanceNode(InstanceResource* res,
osg::ref_ptr<osg::Node>& output,
const osgDB::Options* readOptions)
{
output = 0L;
std::string key = res->getConfig().toJSON(false);
// exclusive lock (since it's an LRU)
{
Threading::ScopedMutexLock exclusive( _instanceMutex );
// double check to avoid race condition
InstanceCache::Record rec;
if ( _instanceCache.get(key, rec) && rec.value().valid() )
{
output = rec.value().get();
}
else
{
// still not there, make it.
output = res->createNode(readOptions);
if ( output.valid() )
{
_instanceCache.insert( key, output.get() );
}
}
}
return output.valid();
}
osg::Node*
ResourceCache::getInstanceNode( InstanceResource* res )
{
osg::Node* result = 0L;
if ( _threadSafe )
{
// first check if it exists
{
Threading::ScopedReadLock shared( _mutex );
InstanceCache::Record rec = _instanceCache.get( res );
if ( rec.valid() )
{
result = rec.value();
}
}
// no? exclusive lock and create it.
if ( !result )
{
Threading::ScopedWriteLock exclusive( _mutex );
// double check to avoid race condition
InstanceCache::Record rec = _instanceCache.get( res );
if ( rec.valid() )
{
result = rec.value();
}
else
{
// still not there, make it.
result = res->createNode( _dbOptions.get() );
if ( result )
_instanceCache.insert( res, result );
}
}
}
else
{
InstanceCache::Record rec = _instanceCache.get( res );
if ( rec.valid() )
{
result = rec.value();
}
else
{
result = res->createNode( _dbOptions.get() );
if ( result )
_instanceCache.insert( res, result );
}
}
return result;
}
bool
ResourceCache::cloneOrCreateInstanceNode(InstanceResource* res,
osg::ref_ptr<osg::Node>& output,
osgDB::Options *localoptions, osgDB::Archive* ar)
{
output = 0L;
std::string key = res->getConfig().toJSON(false);
// exclusive lock (since it's an LRU)
{
Threading::ScopedMutexLock exclusive( _instanceMutex );
// double check to avoid race condition
InstanceCache::Record rec;
if ( _instanceCache.get(key, rec) && rec.value().valid() )
{
output = osg::clone(rec.value().get(), osg::CopyOp::DEEP_COPY_ALL);
}
else
{
// still not there, make it.
if (ar)
{
std::string modelname = res->uri().get().base();
osgDB::ReaderWriter::ReadResult r = ar->readNode(modelname, localoptions);
if (r.validNode())
output = r.getNode();
}
else
{
if (localoptions)
output = res->createNode(localoptions);
else
output = res->createNode(_dbOptions.get());
}
if ( output.valid() )
{
_instanceCache.insert( key, output.get() );
output = osg::clone(output.get(), osg::CopyOp::DEEP_COPY_ALL);
}
}
}
return output.valid();
}
bool
SubstituteModelFilter::findResource(const URI& uri,
const InstanceSymbol* symbol,
FilterContext& context,
std::set<URI>& missing,
osg::ref_ptr<InstanceResource>& output )
{
// be careful about refptrs here since _instanceCache is an LRU.
InstanceCache::Record rec;
if ( _instanceCache.get(uri, rec) )
{
// found it in the cache:
output = rec.value().get();
}
else if ( _resourceLib.valid() )
{
// look it up in the resource library:
output = _resourceLib->getInstance( uri.base(), context.getDBOptions() );
}
else
{
// create it on the fly:
output = symbol->createResource();
output->uri() = uri;
_instanceCache.insert( uri, output.get() );
}
// failed to find the instance.
if ( !output.valid() )
{
if ( missing.find(uri) == missing.end() )
{
missing.insert(uri);
OE_WARN << LC << "Failed to locate resource: " << uri.full() << std::endl;
}
}
return output.valid();
}